Dead tired (4)
'tired?' is the definition.
('out of breath' can be similar in meaning to 'tired')
'dead' is the wordplay.
I cannot really see how this works, but
'dead' could be 'out' (similar in meaning) and 'out' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for out of breath that I've seen before include "Gasping" , "pants?" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">dead tired</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for beat that I've seen before include "Policeman's round" , "Thrash with rhythm?" , "Strike (a drum)" , "Thrash; pulse" , "buffet" .)