Nymph finally embraced by hill god (4)
I believe the answer is:
thor
'god' is the definition.
(Thor is an example)
'nymph finally embraced by hill' is the wordplay.
'finally' says to take the final letters.
'embraced by' indicates putting letters inside.
'hill' becomes 'tor' (tor is a kind of hill).
The final letter of 'nymph' is 'h'.
'h' inserted into 'tor' is 'THOR'.
(Other definitions for thor that I've seen before include "Norse god for whom Thursday is named" , "Germanic deity" , "Norse god of war" , "Wielder of hammer" , "can be classed as immortal" .)