Mast support (4)

I believe the answer is:

spar

(Other definitions for spar that I've seen before include "Mineral; box; wing beam" , "quarrel" , "Mast - boom - gaff" , "Practise boxing with a pole?" , "Argue" .)

I've seen this clue in the Penny Press.

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.