The treble clef is a staff. But it is the hightest staff, yes.
The 4th space on the treble staff is E.
Clef.
The treble clef (not cleft) is a G clef, because it indicates the staff position of the note G.
Treble Clef
The treble clef, which wraps around G on the staff.
The treble clef notes above the staff are F, A, C, E.
The treble clef notes below the staff are F, E, D, C, and B.
The treble clef.
The 4th space on the treble staff is E.
The notes below the staff in treble clef are typically F, E, D, C, and B.
A low C on the treble clef (on the first leger line below the staff) joins with a high C on the Bass clef (the first leger line above the staff)
C4 is located on the treble clef staff as the middle C, which is the note directly below the first ledger line below the staff.
Clefs do not have 'sounds'. They are merely tools to indicate where on the musical stave notes are to be placed. However, the treble clef 'places' higher notes than the bass clef. If a clef is placed in the middle of the staff, then the notes that follow that clef are of that clef. For example, if the bass clef is placed on the treble staff, the notes that follow it are to be interpreted as "bass clef" notes and played using lower notes on the piano. The opposite is true if the treble clef is placed on the bass staff.
Clef.
Treble Clef
G clef is another name for the treble clef (it circles the G line on the staff). It represents a higher range than the bass clef.
The high notes on the treble clef staff are E, F, G, A, B, C, D.