Unscrupulous opportunist putting sign outside hospital (7)
I believe the answer is:
chancer
'unscrupulous opportunist' is the definition.
(I've seen this before)
'sign outside hospital' is the wordplay.
I cannot really understand how this works, but
'hospital' could be 'h' (abbreviation for hospital) and 'h' is located in the answer.
'sign' could be 'can' (can is a kind of sign) and 'can' is located in the leftover letters.
This explanation may well be incorrect...
'putting' is the link.
Can you help me to learn more?
(Other definitions for chancer that I've seen before include "Unscrupulous sort" , "Unscrupulous opportunist" , "Informally, one who tries his luck" , "Exploiter of opportunity" , "One taking risks" .)