Suggest nothing and languish (5)
I believe the answer is:
opine
'suggest' is the definition.
(I've seen this before)
'nothing and languish' is the wordplay.
'nothing' becomes 'o' (looks like zero - 0).
'and' means one lot of letters go next to another.
'languish' becomes 'pine' ('pine' can be a synonym of 'languish'**).
'o'+'pine'='OPINE'
(Other definitions for opine that I've seen before include "Proffer a view" , "Express a point of view" , "State as one's belief" , "judge" , "Hold forth" .)