Hat manufactured only in Shannon town (7)

I believe the answer is:

athlone

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'shannon town' is the definition.
'athlone' can be an answer for 'town' (I have seen 'Irish town ' mean 'athlone' so perhaps 'town' could also mean 'athlone'). I'm unsure of the 'shannon' bit.

'hat manufactured only' is the wordplay.
'manufactured' indicates anagramming the letters.
'only' becomes 'lone' (synonyms).
'hat' with letters rearranged gives 'ath'.
'ath'+'lone'='ATHLONE'

'in' acts as a link.

Can you help me to learn more?

(Other definitions for athlone that I've seen before include "The loan of a town here" , "Irish city" , "location in Ireland" , "Town on River Shannon" , "Irish town; an hotel (anag.)" .)

I've seen this clue in The Telegraph.

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