Both sides with peppered steak for one of the widows going on ahead? (4)

I believe the answer is:

peak

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'both' is the definition.
Both the definition and answer are adjectives. Maybe you can see an association between them that I don't see?

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for peak that I've seen before include "Reach the highest point" , "Sharp pointed summit" , "Apex" , "maximum pitch" , "Pinnacle" .)

I've seen this clue in the Irish Times and the Irish Times (Crosaire).

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