PC momentarily fixed for free (13)
I believe the answer is:
complimentary
'free' is the definition.
(synonyms)
'pc momentarily fixed' is the wordplay.
'fixed' indicates an anagram.
'pc'+'momentarily'='pcmomentarily'
'pcmomentarily' is an anagram of 'COMPLIMENTARY'.
'for' is the link.
(Other definitions for complimentary that I've seen before include "Given free" , "Expressing approval - not to be paid for" , "Flattering" , "Free (ticket); praising" , "Adulatory - gratis" .)