Very iffy? (6)

I believe the answer is:

mighty

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This might be a double definition.

'very' is the first definition.
(synonyms)

'iffy?' is the second definition.
Both the answer and definition are adjectives. Maybe they are linked in a way I don't understand?

Can you help me to learn more?

(Other definitions for mighty that I've seen before include "Arrogant people are often described as high and . . . . . ." , "Powerful - exalted" , "Having great strength" , "Extremely" , "Strong, powerful" .)

I've seen this clue in the Evening Standard.

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