A tough time dealing with things in your heart (6)

I believe the answer is:

atrial

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'dealing with things in your heart' is the definition.
I can't tell whether this definition defines the answer.

'a tough time' is the wordplay.
'tough time' becomes 'trial' (I've seen this in another clue).
'a'+'trial'='ATRIAL'

Can you help me to learn more?

(Other definitions for atrial that I've seen before include "referring to Chambers?" , "Lariat (anag)" , "Like main court" , "Like some courts" , "of the heart cavities" .)

I've seen this clue in The Irish Times.

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