Interruption of testing by India leader of opposition dreads, say? (6)

I believe the answer is:

hairdo

'dreads say?' is the definition.
(I know that dreadlocks is a hairdo)

I can't explain the rest of the clue.

(Other definitions for hairdo that I've seen before include "Say, crew cut" , "Bob, for example" , "Bob, perm or bouffant" , "Barnet" , "Eg, beehive or mullet" .)

I've seen this clue in The Times.

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