Limitations on soup — cold or hot? (5)

I believe the answer is:

spicy

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'hot?' is the definition.
(I know that hot can be written as spicy)

'limitations on soup cold' is the wordplay.
'limitations on soup' becomes 'sp' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'cold' becomes 'icy' (similar in meaning).
'sp'+'icy'='SPICY'

'or' acts as a link.

Can you help me to learn more?

(Other definitions for spicy that I've seen before include "Hot-tasting" , "Pungently flavoured" , "(Of flavours) hot" , "Highly flavoured" , "Aromatic" .)

I've seen this clue in The Guardian.

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