Good to be in control for this! (5)

I believe the answer is:

reign

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'this' is the definition.
The definition suggests a singular noun which matches the answer.

'good to be in control' is the wordplay.
'good' becomes 'g' (abbreviation).
'to be in' indicates putting letters inside.
'control' becomes 'rein' (reining is a kind of controlling).
'g' put inside 'rein' is 'REIGN'.

'for' acts as a link.

Can you help me to learn more?

(Other definitions for reign that I've seen before include "Prevail" , "Rule over in Niger" , "Period of monarch" , "Niger (anag)" , "Hold sway, rule" .)

I've seen this clue in The Sun.

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