The most common and most likely answer to this crossword clue is the 7 letter word EXACTOR
I've seen this crossword clue in The Daily Telegraph
E
X
A
C
T
O
R
More clues leading to the result EXACTOR
- Demanding person’s coat, Rex out of order
- Refuse cold chop sent back for demanding chap
- Demanding type, discarded player
- Former player – demanding one
- Retired thespian appearing as Shylock?
- Strict claimant who’s presumably now permanently resting?
- Former thespian is one demanding rights
- One who used to be in film is demanding person
- Retired thespian — one who makes demands
- One no longer playing a part as an unreasonably demanding type?
Buddy explains!

The straight part
We know that "Shylock" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case shylock = exactor.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.