26 across
Surmise
long
after
love
(5)
Surmise long after love (5)
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The definition is at the beginning of the clue.
How the clue works
Surmise is your definition — to guess or suppose. For the wordplay, take O (love, the tennis score for zero) and stick PINE after it (to pine is to long for something), and you've got your answer.