Crossword Genius

Calls round and smiles (5)

Ross

I believe the answer is:

grins

I'm a little stuck... Click here to teach me more about this clue!

'smiles' is the definition.
(I know this)

'calls round and' is the wordplay.
'calls' becomes 'gris' (I can't explain this - if you can you should believe this answer much more).
'round' indicates putting letters inside.
'and' becomes 'n' (common abbreviation for 'and').
'gris' placed around 'n' is 'GRINS'.

Can you help me to learn more?

(Another definition for grins that I've seen is " Broad smiles".)

I've seen this clue in The Globe and Mail.
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