Pal up with bachelor - terribly refined! (8)
I believe the answer is:
befriend
'pal up with' is the definition.
(I've seen this before)
'bachelor terribly refined' is the wordplay.
'bachelor' becomes 'b' (abbreviation e.g. BA=Bachelor of Arts).
'terribly' indicates an anagram.
'refined' anagrammed gives 'efriend'.
'b'+'efriend'='BEFRIEND'
(Other definitions for befriend that I've seen before include "guide?" , "Find beer (anag.)" , "Become close to (someone)" , "Provide support as a chum" , "Bond with" .)