Crossword Genius

A whole number teeing off close to marker (7)

Ross

I believe the answer is:

integer

'a whole number' is the definition.
('integer' can be a synonym of 'whole number')

'teeing off close to marker' is the wordplay.
'off' is an anagram indicator.
'close to' says to take the final letters (the close/ending of).
The final letter of 'marker' is 'r'.
'teeing' with letters rearranged gives 'intege'.
'intege'+'r'='INTEGER'

(Other definitions for integer that I've seen before include "Treeing (anag.)" , "Gin tree (anag)" , "Get Erin (anag)" , "Whole unit" , "rational number remains" .)

I've seen this clue in The Telegraph and The Guardian.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.