The most common and most likely answer to this crossword clue is the 7 letter word TRACKER
I've seen this crossword clue in The Guardian
T
R
A
C
K
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More clues leading to the result TRACKER
Buddy explains!

The straight part
We know that "huntsman" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case huntsman = tracker.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 TRACKER mean?
TRACKER noun- Agent noun of track; one who, or that which, tracks or pursues, as a man or dog that follows game.
- In an organ, a light strip of wood connecting (in path) a key and a pallet, to communicate motion by pulling.
- A type of computer software for composing music by aligning samples on parallel timelines.
- A musician who writes music in a tracker.
- A computer program that monitors something.
- A tracker mortgage.