The most common and most likely answer to this crossword clue is the 2 plus 6 plus 7 letter word NO SPRING CHICKEN
I've seen this crossword clue in The Times
N
O
S
P
R
I
N
G
C
H
I
C
K
E
N
More clues leading to the result NO SPRING CHICKEN
- Out of bounds? Birdie after getting past it
- Dodgy hip concerns king, being this?
- Old and cowardly, with an absence of bounce
- An oldie lacking resilience without backbone
- Turning on water supply, likely to bottle it, being mature
- Ageing boiler has run out of water?
- Getting on to police — pinching conkers!
- Reckons pinching wrinkles – to reveal someone elderly?
- Getting on trampoline afraid after refusal
- Old bird out of bounds?
Buddy explains!

The straight part
We know that "Old" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case old = no spring chicken.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.