Band securing locks in small bar (9)

I believe the answer is:

scrunchie

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'band securing locks' is the definition.
I know nothing about this answer so I cannot judge whether this works.

'small bar' is the wordplay.
'small' becomes 's' (abbreviation - e.g. clothes size).
'bar' becomes 'Crunchie' (chocolate bar).
's'+'crunchie'='SCRUNCHIE'

'in' is the link.

Can you help me to learn more?

(Other definitions for scrunchie that I've seen before include "hair fastener" , "Elasticated hair grip" , "Circular band for holding hair back" .)

I've seen this clue in The Telegraph.

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