On reflection, Sunak and current government is submissive (4)

I believe the answer is:

gimp

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'is submissive' is the definition.
I can't judge whether this defines the answer.

'on reflection sunak and current government' is the wordplay.
'on reflection' shows that the letters should be reversed in order.
'sunak' becomes 'pm' (I can't justify this - if you can you should believe this answer much more).
'and' says to put letters next to each other.
'current' becomes 'I' (physics symbol).
'government' becomes 'g' (abbreviation for government).
'pm'+'i'+'g'='pmig'
'pmig' backwards is 'GIMP'.

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