Force breaches defences (8)

I believe the answer is:

ramparts

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'defences' is the definition.
(rampart is a kind of defence)

'force breaches' is the wordplay.
'force' becomes 'ram' (synonyms).
'breaches' becomes 'parts' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'ram'+'parts'='RAMPARTS'

Can you help me to learn more?

(Other definitions for ramparts that I've seen before include "used defensively" , "Sheep bits for fortifications" , "Defensive walls with parapets" , "Defensive fortifications" , "Defensive walling" .)

I've seen this clue in The Times.

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