We hug writer of "Grand Slam" (2,4)
I believe the answer is:
us open
'slam' is the definition.
(one of the four Grand Slam tennis tournaments)
'we hug writer of grand' is the wordplay.
I cannot really understand how this works, but
'we' could be 'us' and 'us' is located in the answer.
'hug' could be 'o' (O can represent a hug in written messages) and 'o' is present in the answer.
'writer' could be 'pen' (something which writes) and 'pen' is present in the answer.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
I've seen this clue in the Sydney Morning Herald.
Want a hint initially instead of a full solution?
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