The most common and most likely answer to this crossword clue is the 9 letter word PRETENDER
I've seen this crossword clue in Independent
P
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More clues leading to the result PRETENDER
- Claimant to throne pleased at first about offer
- Before submission, one typically makes a claim
- Not post to offer professor
- E.g. James Stuart, an indulger in make-believe?
- Pressure concerning young claimant to the throne
- Phony prince initially about to get offer
- Person making a claim before proposal
- One has aspirations before the contract bid
- Candidate in sandwich shop having goal to meet the Queen
- Peter Andre’s not a false claimant
Buddy explains!

The straight part
We know that "Person making a claim" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case person making a claim = pretender.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 PRETENDER mean?
PRETENDER noun- A person who professes beliefs and opinions that they do not hold.
- A claimant to an abolished or already occupied throne.