Russell embraces contrary captain quickly (2,4)

'quickly' is the definition.
(to do something at pace is to do it quickly)

'russell embraces contrary captain' is the wordplay.
'russell' becomes 'ae' (I've seen this in other clues).
'embraces' means one lot of letters goes inside another.
'contrary' says the letters should be written in reverse.
'captain' becomes 'capt' (abbreviation).
'capt' backwards is 'tpac'.
'ae' placed around 'tpac' is 'AT PACE'.