The most common and most likely answer to this crossword clue is the 3 plus 2 plus 3 letter word HIT IT OFF
I've seen this crossword clue in The Daily Telegraph
H
I
T
I
T
O
F
F
More clues leading to the result HIT IT OFF
- Click with H?
- Mimic successfully adopting new technology to get on
- Success! Yours truly and fop get along
- Success with sex turned sour? Get on
- Get on well with upper-class sort on Polynesian island? No thanks!
- Belt one aristo’s got on
- Get on well with international posh type supporting strike
- Quickly get on with independent upper-class chap supporting strike
- . Fit to fight? Got extremely hurt and made friends
- Reached the target? Hatless gentleman became cordial quickly
Buddy explains!
The straight part
We know that "Quickly get on with" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case quickly get on with = hit it off.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.