Cryptic crossword clue
I’ve to replace gold in battery — it’s adding up 12

The most common and most likely answer to this crossword clue is the 12 letter word ACCUMULATIVE

I've seen this crossword clue in The Times
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Buddy explains!

The straight part
We know that "adding up" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case adding up = accumulative.
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 ACCUMULATIVE mean?

ACCUMULATIVE adjective
  1. Characterized by accumulation; serving to collect or amass
  2. Having a propensity to amass; acquisitive.

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