Fashion on sale as at certain periods (8)

I believe the answer is:

seasonal

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'at certain periods' is the definition.
I can't tell whether this defines the answer.

'fashion on sale as' is the wordplay.
'fashion' is an anagram indicator.
'on'+'sale'+'as'='onsaleas'
'onsaleas' is an anagram of 'SEASONAL'.

Can you help me to learn more?

(Other definitions for seasonal that I've seen before include "Relating to spring, summer etc." , "Occurring at particular times of the year" , "Varying according to time of year" , "Also sane (anag.)" , "not wanted all year" .)

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