Sticky stuff coating large end of rectangular dressing (7)
I believe the answer is:
plaster
'dressing' is the definition.
(plaster is a type of medical dressing)
'sticky stuff coating large end of rectangular' is the wordplay.
I cannot quite understand how this works, but
'large' could be 'l' (eg in clothes sizes) and 'l' is located in the answer.
'stuff' could be 'paste' (paste is a kind of stuff) and 'paste' is located in the leftover letters.
A single letter 'r' remains which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for plaster that I've seen before include "Wall surface" , "____ of Paris" , "Wall and ceiling covering" , "Medical dressing" , "Small wound dressing" .)