Tolerate erasing Romeo in script (4)
I believe the answer is:
book
'script' is the definition.
(I know that script can be written as book)
'tolerate erasing romeo' is the wordplay.
'tolerate' becomes 'brook' (synonyms).
'erasing' suggests deleting specific letters.
'romeo' becomes 'R' (phonetic alphabet: alpha, bravo, charlie etc.).
'brook' with 'r' taken away is 'BOOK'.
'in' acts as a link.
(Other definitions for book that I've seen before include "Reading volume" , "Take down name of offending player" , "Reserve;tome" , "thing that shouldn't be cooked?" , "Reserve - volume" .)