Suppose there's nothing to long for (5)
I believe the answer is:
opine
'suppose' is the definition.
(I've seen this before)
'nothing to long for' is the wordplay.
I cannot quite understand how this works, but
'nothing' could be 'o' (looks like zero - 0) and 'o' is present in the answer.
'long' could be 'pine' (to pine for someone is to long for them) and 'pine' is located in the answer.
This accounts for all the letters.
This explanation may well be incorrect...
'there's' acts as a link.
Can you help me to learn more?
(Other definitions for opine that I've seen before include "Consider" , "State as one's belief" , "Express a point of view" , "Express or hold view" , "State one's held view" .)