Time inside does maybe discourage (5)

I believe the answer is:

deter

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'discourage' is the definition.
('deter' can be a synonym of 'discourage')

'time inside does maybe' is the wordplay.
'time' becomes 't'.
'inside' means one lot of letters goes inside another.
'does maybe' becomes 'deer' (I've seen this in other clues. I am not sure about the 'maybe' bit.**).
't' put into 'deer' is 'DETER'.

Can you help me to learn more?

(Other definitions for deter that I've seen before include "Put off (from an action)" , "Check" , "Frighten off; prevent" , "'Discourage, dissuade (5)'" , "Daunt" .)

I've seen this clue in The Guardian.

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