Crossword Genius

Period when discharge comes up (4)

Ross

I believe the answer is:

time

'period' is the definition.
(time is a kind of period)

'discharge comes up' is the wordplay.
'discharge' becomes 'emit' (emitting is a kind of discharging).
'comes up' says the letters should be written backwards.
'emit' back-to-front is 'TIME'.

'when' is the link.

(Other definitions for time that I've seen before include "The father of Truth, presumably" , "It's done in prison" , "Bird" , ""The enemy"" , "Great healer, so they say" .)

I've seen this clue in The Times.
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