Present box unopened (5)
I believe the answer is:
offer
'present' is the definition.
(thesaurus)
'box unopened' is the wordplay.
'box' becomes 'coffer' (coffer is a kind of box).
'unopened' means to remove the first letter.
'coffer' with its first letter taken away is 'OFFER'.
(Other definitions for offer that I've seen before include "Proposal; reduced price" , "Make available for sale" , "Tender or propose" , "Tender for acceptance" , "Propose (to give)" .)