Man tripped and exclaimed in pain (6)
I believe the answer is:
fellow
'man' is the definition.
(I know that fellow is a type of man)
'tripped and exclaimed in pain' is the wordplay.
I cannot really understand how this works, but
'in pain' could be 'ow' (I've seen this in other clues) and 'ow' is found within the answer.
The remaining letters 'fell' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for fellow that I've seen before include "Boy or man" , "Informally, a man, or the other of a pair" , "Academic chap?" , "Neglected child" , "Informal chap, or member of learned society" .)