Cryptic crossword clue
Love to get boost after day lacking variety 9

The most common and most likely answer to this crossword clue is the 9 letter word MONOTONIC

I've seen this crossword clue in The Guardian
M
O
N
O
T
O
N
I
C

Buddy explains!

The straight part
We know that "lacking variety" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case lacking variety = monotonic.
The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

What does MONOTONIC mean?

MONOTONIC adjective
  1. Of or using the Greek system of diacritics which discards the breathings and employs a single accent to indicate stress. It replaced polytonic system in 1982.
  2. Said of a function that either never decreases or never increases as its independent variable increases.
  3. Uttered in a monotone; monotonous.

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