Enter a clue or pattern or both:
The Clue
Combines, in a way (4 letter answer)
The Answer
ADDS
Tags
Notes
The answer ADDS is seen frequently, appearing about once every 70 puzzles.
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Annexes
Appends
Attaches
Augments
Combines
Contributes
Dubs in
Increases
Kicks in
Postfixes
Puts in
Puts on
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Supplements
Tacks on
Tallies
Throws in
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Tots
Does arithmetic
Does sums
Figures the bill
Finds the sum
Foots (up)
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Uses an abacus
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Writes further
Does some arithmetic
Does sum work
Writes as a postscript, say
Puts two and two together