Supple Penny exposed to risk (7)
I believe the answer is:
pliable
'supple' is the definition.
(thesaurus)
'penny exposed to risk' is the wordplay.
'penny' becomes 'p'.
'exposed to risk' becomes 'liable' (I've seen this before).
'p'+'liable'='PLIABLE'
(Other definitions for pliable that I've seen before include "Easily bent" , "Elastic" , "Ductile" , "accommodating" , "easily influenced" .)