Crossword Genius

Have a go and weigh it! Rival uncertain (4,2,1,5)

Ross

I believe the answer is:

give it a whirl

'have a go' is the definition.
(both can mean to try something)

'weigh it rival uncertain' is the wordplay.
'uncertain' indicates an anagram.
'weigh'+'it'+'rival'='weighitrival'
'weighitrival' with letters rearranged gives 'GIVE IT A WHIRL'.

'and' is the link.

(Another definition for give it a whirl that I've seen is " Try something".)

I've seen this clue in The Guardian.
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