Issue them with a certain amount of kit (4)
I believe the answer is:
emit
'issue' is the definition.
(both can mean to give out or radiate)
'them with a certain amount of kit' is the wordplay.
I cannot really see how this works, but
'them' could be 'em' ('em is an informal way of saying 'them') and 'em' is found in the answer.
'amount' could be 't' (T is an example) and 't' is found within the answer.
A single letter 'i' remains 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 emit that I've seen before include "'Give off, odour say (4)'" , "Produce and discharge" , "Expel" , "Send forth" , "Small turtle" .)