What does the cryptic crossword clue "Two months to boil down (6)" mean?

The definition is "boil down". The wordplay uses a deletion. DEC (deletion) + OCT (deletion) = DECOCT; definition: "boil down" The answer is DECOCT.

Two months to boil down (6)

Guardian Cryptic #27619 | 1 Down | 2018-09-20 flower