No longer clear? Try and make it so (7)
I believe the answer is:
explain
'try and make it so' is the definition.
I can't tell whether this defines the answer.
'no longer clear?' is the wordplay.
'no longer' becomes 'ex' (prefix meaning former or onetime).
'clear?' becomes 'plain' (similar in meaning).
'ex'+'plain'='EXPLAIN'
Can you help me to learn more?
(Other definitions for explain that I've seen before include "area affected by mountain formation?" , "offer clarification" , "Expound" , "Elucidate - define" , "Justify" .)