The most common and most likely answer to this crossword clue is the 4 letter word BUNT
I've seen this crossword clue in The Times
B
U
N
T
More clues leading to the result BUNT
Buddy explains!

The straight part
We know that "hit with head" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case hit with head = bunt.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 BUNT mean?
BUNT noun- The middle part, cavity, or belly of a sail; the part of a furled sail which is at the center of the yard.
- A push or shove; a butt.
- A ball that has been intentionally hit softly so as to be difficult to field, sometimes with a hands-spread batting stance or with a close-hand, choked-up hand position. No swinging action is involved.
- The act of bunting.
- The second half of an outside loop, from level flight to inverted flight.
- A fungus (Ustilago foetida) affecting the ear of cereals, filling the grains with a foetid dust; pepperbrand.
- To push with the horns; to butt.
- To spring or rear up.
- To intentionally hit softly with a hands-spread batting stance.
- To intentionally hit a ball softly with a hands-spread batting stance.
- To perform (the second half of) an outside loop.
- To swell out.
- (of a cat) To headbutt affectionately.