Cryptic crossword clue
Chicken given supplements ultimately displays signs of ageing 7

The most common and most likely answer to this crossword clue is the 7 letter word YELLOWS

I've seen this crossword clue in The Daily Telegraph
Y
E
L
L
O
W
S


Buddy explains!

The straight part
We know that "displays signs of ageing" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case displays signs of ageing = yellows.
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 YELLOWS mean?

YELLOWS noun
  1. The colour of gold, butter, or a lemon; the colour obtained by mixing green and red light, or by subtracting blue from white light.
  2. The intermediate light in a set of three traffic lights, the illumination of which indicates that drivers should stop short of the intersection if it is safe to do so.
  3. One of the colour balls used in snooker, with a value of 2 points.
  4. (pocket billiards) One of two groups of object balls, or a ball from that group, as used in the principally British version of pool that makes use of unnumbered balls (the (yellow(s) and red(s)); contrast stripes and solids in the originally American version with numbered balls).
  5. A yellow card.
  6. Any of various pierid butterflies of the subfamily Coliadinae, especially the yellow coloured species. Compare sulphur.
YELLOWS verb
  1. To become yellow or more yellow.
  2. To make (something) yellow or more yellow.

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