The most common and most likely answer to this crossword clue is the 7 letter word ADAPTER
I've seen this crossword clue in The Times
A
D
A
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More clues leading to the result ADAPTER
- Fitter on trailer modifying attachment
- Plug more suitable after another sort of plug
- Plug fitting better — because of this?
- Leaders in acoustics designed more suitable connector
- Plug more suitable behind another plug
- Fitter going after plug for electrical device
- Plug fitter for electrical accessory
- Device requiring a trade-off to include parking
- Publicity likely over Queen arranger
- Device putting suitable ruler under notice
Buddy explains!

The straight part
We know that "Plug fitting better — because of this?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case plug fitting better — because of this? = adapter.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 ADAPTER mean?
ADAPTER noun- One who is capable of adapting to differing situations.
- One who adapts a thing, e.g. a play.
- A device or application used to achieve operative compatibility between devices that otherwise are incompatible.