About to crack? This may be called for (7)
I believe the answer is:
resolve
'this may be called for' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.
'about to crack?' is the wordplay.
'about' becomes 're' ('re' means regarding or about).
'to crack?' becomes 'solve' (crack can mean to solve or decipher).
're'+'solve'='RESOLVE'
Can you help me to learn more?
(Other definitions for resolve that I've seen before include "Firmly decide" , "Analyse" , "Sort out (a problem)" , "Settle (a matter)" , "split up" .)