The most common and most likely answer to this crossword clue is the 5 letter word CISSY
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More clues leading to the result CISSY
Buddy explains!

The straight part
We know that "Wimp" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case wimp = cissy.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 CISSY mean?
CISSY noun- A cisgender or cissexual person.
- An effeminate boy or man.
- A timid, unassertive or cowardly person.
- (BDSM) A male crossdresser who adopts feminine behaviours.
- Sister.
- Urination; urine.