Crossword Genius

Small defence under pressure, promise to fight? (7)

Ross

I believe the answer is:

pillbox

I'm a little stuck... Click here to teach me more about this clue!

'small defence' is the definition.
(type of small fort)

'under pressure promise to fight?' is the wordplay.
'under pressure promise' becomes 'pill' (I can't justify this - if you can you should give a lot more credence to this answer).
'to fight?' becomes 'box' (boxing is a kind of fighting).
'pill'+'box'='PILLBOX'

Can you help me to learn more?

(Other definitions for pillbox that I've seen before include "Small case for tablets - small concrete fort" , "Woman's round hat (containing tablets?)" .)

I've seen this clue in The Times.
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