Crossword Genius

Mysterious eager breed of diving bird (5,5)

Ross

I believe the answer is:

eared grebe

'diving bird' is the definition.

'mysterious eager breed' is the wordplay.
'mysterious' indicates an anagram.
'eager'+'breed'='eagerbreed'
'eagerbreed' with letters rearranged gives 'EARED GREBE'.

'of' is the link.

I've seen this clue in The Hindu.
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