Take great pleasure in hugging one rescuer (7)
I believe the answer is:
saviour
'rescuer' is the definition.
(synonyms)
'take great pleasure in hugging one' is the wordplay.
'take great pleasure in' becomes 'savour'.
'hugging' means one lot of letters goes inside another.
'one' becomes 'I' (Roman numeral).
'savour' enclosing 'i' is 'SAVIOUR'.
(Other definitions for saviour that I've seen before include "Rescuer" , "Round, flat plate" , "preservative type" , "Mankind's deliverer (The Scaffold's Lily 15)" , "Deliverer or redeemer" .)