It causes a lot of extra work in the theatre (5,5)

'work in the theatre' is the definition.
I know nothing about this answer so I cannot judge whether this works.

'it causes a lot of extra' is the wordplay.
I cannot really understand how this works, but
'it' could be 'e' ('e' can mean 'electronic' which is similar to 'IT') and 'e' is located in the answer.
'lot' could be 'd' and 'd' is found within the answer.
'of' could be 'o' and 'o' is present in the answer.
'extra' could be 'w' (abbreviation for 'wide' - cricket) and 'w' is found within the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?