The most common and most likely answer to this crossword clue is the 2 letter word LO
L
O
Buddy explains!

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 LO mean?
LO interjection- Look, see, behold (in an imperative sense).
- Situated close to, or even below, the ground or another normal reference plane; not high or lofty.
- Of less than normal height; below the average or normal level from which elevation is measured.
- Not high in status, esteem or rank, dignity, or quality. (Compare vulgar.)
- Humble, meek, not haughty.
- Disparaging; assigning little value or excellence.
- Being a nadir, a bottom.
- Depressed in mood, dejected, sad.
- Lacking health or vitality, strength or vivacity; feeble; weak.
- Small, not high (in amount or quantity, value, force, energy, etc).
- Simple in complexity or development; (in several set phrases) favoring simplicity; (see e.g. low church, Low Tory).
- (in several set phrases) Being near the equator.
- (acoustics) Grave in pitch, due to being produced by relatively slow vibrations (wave oscillations); flat.
- Quiet; soft; not loud.
- Made with a relatively large opening between the tongue and the palate; made with (part of) the tongue positioned low in the mouth, relative to the palate.
- Lesser in value than other cards, denominations, suits, etc.
- Not rich or seasoned; offering the minimum of nutritional requirements; plain, simple.
- (of an automobile, gear, etc) Designed for a slow (or the slowest) speed.