Fifty, number on flier in Beds town (8,7)

I believe the answer is:

leighton buzzard

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'beds town' is the definition.
(I've seen this before)

'fifty number on flier in' is the wordplay.
'fifty' becomes 'l' (Roman numeral).
'number' becomes 'eight' (eight is a kind of number).
'flier in' becomes 'buzzard' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'l'+'eight'+'on'+'buzzard'='LEIGHTON BUZZARD'

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(Other definitions for leighton buzzard that I've seen before include "Bedfordshire town - hunt grizzled boa (anag)" , "Beds town" , "somewhere in Bedfordshire" .)

I've seen this clue in The Telegraph.

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