Cryptic crossword clue
Wire penthouse up – internal electrical unit required 5

The most common and most likely answer to this crossword clue is the 5 letter word NEPER

I've seen this crossword clue in Financial Times
N
E
P
E
R

Buddy explains!

The straight part
We know that "electrical unit" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case electrical unit = neper.
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 NEPER mean?

NEPER noun
  1. A non-SI unit of the attenuation (or sometimes gain) of field and power quantities such as electronic signals; the natural logarithm of a ratio, with 1 Np (a ratio of 2.718:1) being equivalent to 8.686 dB.

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