For me to back a lad is an honour (5)

I believe the answer is:

medal

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'an honour' is the definition.
(medal is a kind of honour)

I cannot understand how the remainder of the clue works.

(Other definitions for medal that I've seen before include "Small metal disc as reward or prize" , "Olympic award" , "Decoration, award" , "Religious or commenorative metal piece" , "Award for merit" .)

I've seen this clue in the Evening Standard.

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