The most common and most likely answer to this crossword clue is the 7 letter word SMILING
I've seen this crossword clue in The Daily Telegraph
S
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More clues leading to the result SMILING
Buddy explains!

The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does SMILING mean?
SMILING verb- To have (a smile) on one's face.
- To express by smiling.
- To express amusement, pleasure, or love and kindness.
- To look cheerful and joyous; to have an appearance suited to excite joy.
- To be propitious or favourable; to countenance.
- The action of the verb to smile.
- That smiles or has a smile.