Scotland's contribution to 'Allo 'Allo (5)

I believe the answer is:

alloa

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'scotland's contribution' is the definition.
The definition suggests a singular noun which matches the answer.

''allo 'allo' is the wordplay.
''allo' becomes 'a' (I can't justify this - if you can you should give a lot more credence to this answer).
'allo'+'a'='ALLOA'

'to' is the link.

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(Other definitions for alloa that I've seen before include "possible cup opponent" , "Town near Stirling" , "Central Scottish town" , "Town on Firth of Forth" , "Town built" .)

I've seen this clue in the Evening Standard.

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