The most common and most likely answer to this crossword clue is the 4 letter word LAMP
I've seen this crossword clue in The Times
L
A
M
P
More clues leading to the result LAMP
- To hit — heavy or light
- Light close to central current unit
- Lighter grip, head released
- Light using large unit of electrical current
- Source of light circuit Mike’s installed
- Mark goes inside to drink punch
- Strike a light
- Light punch
- This could be standard place for filming politician
- Appliance needing large unit of current?
Buddy explains!

The straight part
We know that "light" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case light = lamp.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 LAMP mean?
LAMP noun- A device that generates heat, light or other radiation. Especially an electric light bulb.
- A device containing oil, burnt through a wick for illumination; an oil lamp.
- A piece of furniture holding one or more electric light sockets.
- To hit, clout, belt, wallop.
- To hunt at night using a lamp; see lamping.
- To hang out or chill; to do nothing in particular.