Crossword Genius

Make love legible in letters from the heart (6)

Ross

I believe the answer is:

oblige

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'make' is the definition.
(obliging is a kind of making)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for oblige that I've seen before include "Compel (someone to do something)" , "serve" , "Put oneself out for" , "Hold in debt" , "Do favour or coerce" .)

I've seen this clue in the Sydney Morning Herald.
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