The most common and most likely answer to this crossword clue is the 2 plus 5 letter word ON OFFER
I've seen this crossword clue in The Daily Telegraph
O
N
O
F
F
E
R
More clues leading to the result ON OFFER
- Erratic monarch available
- Available for one disturbed about fine
- Like a bargain? One not available continuously?
- Employer drained after working away for purchase
- One for free initially being flogged at a reduced price?
- Available for one worried about onset of flu
- Reduced variable? I’m not sure
- Uncertain — I’m hesitant, but available
- Switch positions before emergency room in America becomes available
- Available for one wrongly parted by force
Buddy explains!

The straight part
We know that "Available" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case available = on offer.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.