The most common and most likely answer to this crossword clue is the 3 plus 5 letter word SEE STARS
I've seen this crossword clue in The Times
S
E
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More clues leading to the result SEE STARS
- Appreciates sailors suffer as result of severe blow?
- Recognise celebrities? Do this, perhaps, if struck
- Feel dazed, as you can in all these across solutions
- After dates sailors are in a daze
- What astronomers do after receiving a blow to the head?
- Experience heavy blow, as would Oscars attendee?
- Recognises sailors feel dazed?
- a Gatecrashers at Oscars after-party will no doubt be dazed
Buddy explains!

The straight part
We know that "Recognise celebrities?/Do this, perhaps, if struck" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case recognise celebrities?/do this, perhaps, if struck = see stars.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.