Difficult — as peak may be? (5)

I believe the answer is:

rocky

This clue is a double definition.

'difficult' is the first definition.
('rocky' can be similar in meaning to 'difficult')

'as peak may be?' is the second definition.

(Other definitions for rocky that I've seen before include "Unstable US mountain range?" , "Unsteady; like boulders" , "Uneven" , "Stony; unsteady" , "Unreliable" .)

I've seen this clue in The Times.

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