Start firing again (7)
I believe the answer is:
relight
'start' is the definition.
Both the answer and definition are verbs in their base form.
Perhaps they are linked in a way I don't understand?
'firing again' is the wordplay.
I cannot quite see how this works, but
'again' could be 're' (prefix meaning 'again') and 're' is found in the answer.
The remaining letters 'light' 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 relight that I've seen before include "set off again" , "Ignite again" , "Rekindle" , "get going over" , "fire again?" .)