The most common and most likely answer to this crossword clue is the 11 letter word SPECIALISED
I've seen this crossword clue in The Sunday Telegraph
S
P
E
C
I
A
L
I
S
E
D
Buddy explains!
The straight part
We know that "for a particular purpose" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case for a particular purpose = specialised.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 SPECIALISED mean?
SPECIALISED verb- To make distinct or separate, particularly:
- To become distinct or separate, particularly:
- Highly skilled in a specific field.