Electrician requiring second deposit (5)
I believe the answer is:
spark
'electrician' is the definition.
(informal term for an electrician)
'second deposit' is the wordplay.
I cannot quite see how this works, but
'second' could be 's' (common abbreviation) and 's' is present in the answer.
The remaining letters 'park' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
'requiring' is the link.
Can you help me to learn more?
(Other definitions for spark that I've seen before include "Fiery particle" , "Clever person" , "bit of fire?" , "Quantity of electricity" , "Tiny, red-hot particle" .)