The most common and most likely answer to this crossword clue is the 7 letter word BABYSAT
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More clues leading to the result BABYSAT
Buddy explains!

The straight part
We know that "Looked after a child" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case looked after a child = babysat.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 BABYSAT mean?
BABYSAT verb- To watch or tend someone else's child for a period of time, often for money.
- To watch or attend anything or anyone unnecessarily closely; to have to help or coax too much.