Getting used to REM's cracking popular tune, Strange (9)
I believe the answer is:
inurement
'getting' is the definition.
Both the definition and answer are singular nouns.
Maybe there's a link between them I don't understand?
'to rem's cracking popular tune strange' is the wordplay.
'cracking' indicates putting letters inside (inserted letters go into a gap or crack).
'popular' becomes 'in' ('in' can mean trendy).
'strange' is an anagram indicator.
'tune' is an anagram of '[tune]'.
'in'+'[tune]'='in[tune]'
'rem' inserted within 'inuent' is 'INUREMENT'.
'used' acts as a link.
Can you help me to learn more?
(Other definitions for inurement that I've seen before include "getting into the habit" , "Action of accustoming (someone to something)" .)