'Blur' band ends, forming other group initially (5)

I believe the answer is:

befog

'blur' is the definition.
(thesaurus)

'band ends forming other group initially' is the wordplay.
'initially' indicates taking the first letters.
The first letters of 'band ends forming other group' is 'BEFOG'.

(Other definitions for befog that I've seen before include "cloud" , "Obscure" , "Make confused" , "Bewilder" , "Envelop in mist: confuse" .)

I've seen this clue in The Telegraph.

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