The most common and most likely answer to this crossword clue is the 6 letter word STEADY
I've seen this crossword clue in The Times
S
T
E
A
D
Y
More clues leading to the result STEADY
- Customary small drink drained daily
- Irregular dates happily in the end becoming a regular one?
- Ready follower is resolute
- Take care, sweetheart
- Place with company, finally, as regular partner
- Various dates over year leading to regular boyfriend
- Wrong date, say, not a date seen regularly
- Regular small cuppa, duly emptied
- Unhappy year when kept outside confines of the stable
- Perpetual happiness finally found by not a large charwoman?
Buddy explains!

The straight part
We know that "Take care/sweetheart" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case take care/sweetheart = steady.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 STEADY mean?
STEADY noun- A rest or support, as for the hand, a tool, or a piece of work.
- A regular boyfriend or girlfriend.
- A prostitute's regular customer.
- To stabilize something; to prevent from shaking.
- Firm in standing or position; not tottering or shaking; fixed; firm.
- Constant in feeling, purpose, or pursuit; not fickle, changeable, or wavering; not easily moved or persuaded to alter a purpose; resolute.
- Smooth and not bumpy or with obstructions.
- Regular and even.
- Slow.
- To row with pressure at a low stroke-rating, often 18 strokes per minute.