Allowances of food for rodent - one on show originally (7)

I believe the answer is:

rations

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'allowances of food for' is the definition.
'rations' can be an answer for 'allowances' (I've seen this before). I'm not certain of the 'of food for' bit.

'rodent one on show originally' is the wordplay.
'rodent' becomes 'rat' (rat is a kind of rodent).
'one' becomes 'i' (Roman numeral).
'originally' indicates taking the first letters.
The initial letter of 'show' is 's'.
'rat'+'i'+'on'+'s'='RATIONS'

Can you help me to learn more?

(Other definitions for rations that I've seen before include "Fare" , "Commons" , "Limits (supplies)" , "fixed allowance" , "Foodstuffs" .)

I've seen this clue in The Daily Express.

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