The most common and most likely answer to this crossword clue is the 10 letter word HORSEPOWER
I've seen this crossword clue in The Daily Telegraph
H
O
R
S
E
P
O
W
E
R
More clues leading to the result HORSEPOWER
- In training, rower hopes to achieve measure of potency
- Strength shown by prisoner rescued by extraordinary heroes before end of war
- Strength in a stable marriage never ends, hope rows frivolous?
- Punch might get this measurement!
- Measure of punch needed for moving?
- Engine’s stable capacity?
- Measure of an Arab’s capacity for work?
- Rowers hope to develop measure of strength
- Measure of strength of an animal by a prisoner of war with hesitation
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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 HORSEPOWER mean?
HORSEPOWER noun- Power derived from the motion of a horse.
- A non-metric unit of power (symbol hp) with various definitions, for different applications. The most common of them is probably the mechanical horsepower, approximately equal to 745.7 watts.
- A metric unit (symbol often PS from the German abbreviation), approximately equal to 735.5 watts.
- Strength.