In time a possible giver of pain (8)
I believe the answer is:
aggrieve
'pain' is the definition.
(I've seen this before)
'in time a possible giver' is the wordplay.
I cannot really understand how this works, but
'a' is within the answer.
an anagram of 'giver' is 'griev' which is within the answer.
The remaining letters 'ge' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
'of' acts as a link.
Can you help me to learn more?
(Other definitions for aggrieve that I've seen before include "Cause to feel sorrow" , "Cause annoyance to" , "Pain or injure" , "Hurt" , "Ill-use" .)