Roll a penny underneath bottom of kerb (3)
I believe the answer is:
bap
'roll' is the definition.
(I've seen this before)
'a penny underneath bottom of kerb' is the wordplay.
'penny' becomes 'p' (**).
'underneath' is a charade indicator (letters next to each other) (I've seen this in other clues).
'bottom of' indicates one should take the final letters.
The final letter of 'kerb' is 'b'.
'a'+'p'='ap'
'ap' put after 'b' is 'BAP'.
(Other definitions for bap that I've seen before include "A soft flat bread roll" , "Large flat round roll" , "Big roll" , "Large soft bread roll" , "Flattish bread roll" .)