Beginning golf, tee off and clean up (5)
I believe the answer is:
debug
'clean up' is the definition.
(to debug is to resolve a computer error)
'beginning golf tee off' is the wordplay.
'beginning' becomes 'debut' (debut is a kind of beginning).
'golf' becomes 'g' (phonetic alphabet: alpha, bravo, charlie etc.).
'tee' becomes 't'.
'off' suggests deleting specific letters.
'debut'+'g'='debutg'
'debutg' with 't' removed is 'DEBUG'.
'and' is the link.
(Other definitions for debug that I've seen before include "Remove software faults" , "Remove error from computer program" , "Fix computer problem" , "Fix software glitches" , "Remove errors from (programme)" .)