Group blocking postgraduate qualification for medicine man (6)

I believe the answer is:

mganga

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'qualification for medicine man' is the definition.
I know nothing about this answer so I cannot judge whether this works.

'group blocking postgraduate' is the wordplay.
'group' becomes 'gang' (a gang is a group of people).
'blocking' is an insertion indicator (block can mean to plug a gap in something).
'postgraduate' becomes 'ma' (Master of Arts is a postgraduate degree).
'gang' put within 'ma' is 'MGANGA'.

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(Another definition for mganga that I've seen is " Charming healer".)

I've seen this clue in The Independent.

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