Pretended to be the electricity man (5)
I believe the answer is:
acted
'pretended' is the definition.
(I've seen this before)
'the electricity man' is the wordplay.
'the electricity' becomes 'ac' (AC is an example).
'man' becomes 'ted' (Ted is a man's name).
'ac'+'ted'='ACTED'
'to be' acts as a link.
(Other definitions for acted that I've seen before include "Took part in play" , "took part in simulation" , "Feigned" , "Pretended" , "Performed on stage" .)