Cryptic crossword clue
Parent is, in part, changing requirement for sweater 14

The most common and most likely answer to this crossword clue is the 14 letter word ANTIPERSPIRANT

I've seen this crossword clue in The Sunday Telegraph
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Buddy explains!

The straight part
We know that "requirement for sweater" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case requirement for sweater = antiperspirant.
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 ANTIPERSPIRANT mean?

ANTIPERSPIRANT noun
  1. A substance used to minimize sweating or perspiration, and usually applied to the underarm area.

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