Promote more (7)

I believe the answer is:

further

This clue is a double definition.

'promote' is the first definition.
(furthering is a kind of promoting)

'more' is the second definition.
('further' can be a synonym of 'more')

(Other definitions for further that I've seen before include "Beyond; also" , "To somewhere more advanced" , "In addition, also" , "To, or at, a greater extent, degree, or a more advanced stage" , "Moreover" .)

I've seen this clue in The Telegraph.

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