Part of sabbatical group (4)

I believe the answer is:

abba

'group' is the definition.

'part of sabbatical' is the wordplay.
'part of' indicates the answer is hidden within the clue.
'ABBA' is hidden in the letters of 'sabbatical'.

(Other definitions for abba that I've seen before include "rhymes in Petrarchan sonnet" , "6 24 113 [SCAN-DIN-AVIAN] band" , "Renowned Swedish foursome" , "Coptic bishop's title; Swedish pop group" , "Swedish pop band of the 1970s" .)

I've seen this clue in The Guardian.

Want a hint initially instead of a full solution? Install my app