Race completely in control of Republicans (6)

I believe the answer is:

gallop

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'race' is the definition.
(thesaurus)

'completely in control of republicans' is the wordplay.
'completely' becomes 'all' (synonyms).
'in' indicates putting letters inside.
'control of republicans' becomes 'gop' (I am not sure about this - if you are sure you should believe this answer much more).
'all' inserted inside 'gop' is 'GALLOP'.

Can you help me to learn more?

(Other definitions for gallop that I've seen before include "Fastest run of a horse" , "Hurry (on horseback?)" , "Fast pace (for horse)" , "Fastest pace of horse" , "Fast gait of a horse" .)

I've seen this clue in The Telegraph.

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