Good to be in control and rule (5)
I believe the answer is:
reign
'rule' is the definition.
(reigning is a kind of ruling)
'good to be in control' is the wordplay.
'good' becomes 'g' (abbreviation).
'to be in' means one lot of letters goes inside another.
'control' becomes 'rein' (synonyms).
'g' going inside 'rein' is 'REIGN'.
'and' acts as a link.
(Other definitions for reign that I've seen before include "Govern" , "Monarch's time in the job" , "Prevail" , "Rule - dominate" , "Spell in office" .)