Approve the execution of a cleaning step to welcome the revolutionary staff (7)

I believe the answer is:

indorse

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'approve' is the definition.
(thesaurus)

'the execution of a cleaning step to welcome the revolutionary staff' is the wordplay.
'the execution of a cleaning step' becomes 'inse' (I can't justify this - if you can you should give a lot more credence to this answer).
'to welcome' means one lot of letters goes inside another (in sense of 'inviting in').
'the revolutionary' is a reversal indicator.
'staff' becomes 'rod' (both can mean a stick or cane).
'rod' backwards is 'dor'.
'inse' enclosing 'dor' is 'INDORSE'.

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I've seen this clue in The Hindu.

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