Take a chance or just think about it (9)
I believe the answer is:
speculate
'take a chance' is the definition.
(thesaurus)
'think about it' is the wordplay.
I cannot really understand how this works, but
'about' could be 'c' (circa) and 'c' is located in the answer.
'it' could be 't' (abbreviation. e.g. in 'tis) and 't' is found within the answer.
This explanation may well be incorrect...
'or just' is the link.
Can you help me to learn more?
(Other definitions for speculate that I've seen before include "Make conjectures" , "Gamble - guess" , "Imagine" , "Form opinion without definite knowledge" , "As before, observe" .)