The most common and most likely answer to this crossword clue is the 2 plus 2 plus 4 letter word GO TO SEED
I've seen this crossword clue in The Times
G
O
T
O
S
E
E
D
More clues leading to the result GO TO SEED
- Visit daughter in decline
- Degenerate daughter on visit
- Visit Bill, but not a degenerate
- Decline to visit daughter
- Bolt in trouble, turned up nursing broken toes at end of race
- Attend religious area with Democrat, get exhausted
- Decline cooked duck egg
- Become exhausted with visit by daughter
- Become run-down? Visit daughter
- Decline visit by daughter
Buddy explains!

The straight part
We know that "decline" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case decline = go to seed.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.