Further belligerent action entertained by US president (7)

I believe the answer is:

forward

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'further' is the definition.
(thesaurus)

'belligerent action entertained by us president' is the wordplay.
'belligerent action' becomes 'war' (military action. I am not sure about the 'belligerent' bit.).
'entertained by' indicates putting letters inside (I've seen this in other clues).
'us president' becomes 'ford' (Gerald Ford).
'war' placed inside 'ford' is 'FORWARD'.

Can you help me to learn more?

(Other definitions for forward that I've seen before include "Attacking player" , "Straight ahead" , "Send on; football player" , "Presumptuous" , "Promote" .)

I've seen this clue in The Telegraph.

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