The most common and most likely answer to this crossword clue is the 5 letter word MIGHT
I've seen this crossword clue in The Times
M
I
G
H
T
More clues leading to the result MIGHT
- Those at the front of May’s injured government havefinally bought power
- Strength from male ousting female in contest
- Strength — could be
- Will possibly sounds like a small child
- Keep buzzer close to television after power failure?
- Great power / could possibly ...
- May, in the past, / showing intensity of feeling
- Force could, possibly
- Power of the ideal man taking out Rolls-Royce
- In power, May’s tense
Buddy explains!

The straight part
We know that "Strength/could be" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case strength/could be = might.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 MIGHT mean?
MIGHT noun- Power, strength, force or influence held by a person or group.
- Physical strength or force.
- The ability to do something.
- Mighty; powerful.
- Possible.
- To be strong; to have power (over).
- (auxiliary) To be able; can.
- To be able to go.
- (modal auxiliary verb, defective) To have permission to, be allowed. Used in granting permission and in questions to make polite requests.
- (modal auxiliary verb, defective) Expressing a present possibility; possibly.
- (subjunctive present, defective) Expressing a wish (with present subjunctive effect).
- Used in modesty, courtesy, or concession, or to soften a question or remark.
- (auxiliary) Used to indicate conditional or possible actions.
- Used to indicate a desired past action that was not done.
- (auxiliary) Even though.
- (auxiliary) Used in polite requests for permission