What does the cryptic crossword clue "A love for indigo (4)" mean?

The definition is "A love". The wordplay uses anagram, charade. anagram of A ("A") + NIL (synonym of "love") = ANIL; definition: "indigo" The answer is ANIL.

A love for indigo (4)

Guardian Cryptic #26897 | 15 Across | 2016-05-30 flower

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Also seen in

Telegraph #28157 (2016-07-04)