Sadly, broken hearts, in the end, need their heads examined (7)

I believe the answer is:

bonkers

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'need their heads examined' is the definition.
I can't judge whether this definition defines the answer.

'sadly broken hearts in the end' is the wordplay.
'sadly' indicates an anagram.
'in the end' suggests the final letters.
The last letter of 'hearts' is 's'.
'broken' anagrammed gives 'bonker'.
'bonker'+'s'='BONKERS'

Can you help me to learn more?

(Other definitions for bonkers that I've seen before include "They could reproduce" , "Slang for crazy, off the wall" , "Cuckoo" , "touched..." , "Quite mad" .)

I've seen this clue in the Sydney Morning Herald.

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