Ditch a prohibition by Trump (7)

I believe the answer is:

abandon

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'ditch' is the definition.
(I've seen this before)

'a prohibition by trump' is the wordplay.
'prohibition' becomes 'ban' (synonyms).
'by trump' becomes 'don' (I can't explain this - if you can you should believe this answer much more).
'a'+'ban'+'don'='ABANDON'

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(Other definitions for abandon that I've seen before include "Kick" , "Czech city" , "Cast aside" , "Walk out on" , "Total lack of inhibition (often gay?)" .)

I've seen this clue in the Sydney Morning Herald.

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