Solve value n, somehow about right (7)
I believe the answer is:
unravel
'solve' is the definition.
(thesaurus)
'value n somehow about right' is the wordplay.
'somehow' indicates anagramming the letters.
'about' means one lot of letters goes inside another.
'right' becomes 'r' (common abbreviation).
'value'+'n'='valuen'
'valuen' anagrammed gives 'unavel'.
'unavel' going around 'r' is 'UNRAVEL'.
(Other definitions for unravel that I've seen before include "Disentangle knitted wool or solve mystery" , "Sort out" , "Unpick, untangle" , "Come undone; solve" , "Solve the problem" .)