Element causing a bit of trouble at home (3)
I believe the answer is:
tin
'element' is the definition.
(tin is a kind of element)
'bit of trouble at home' is the wordplay.
'bit of' suggests taking the first letters.
'at' means one lot of letters go next to another.
'home' becomes 'in' ('he's home' can mean 'he's in'**).
The initial letter of 'trouble' is 't'.
't'+'in'='TIN'
'causing a' is the link.
(Other definitions for tin that I've seen before include "Silvery-white metallic element" , "Silvery white metal" , "Cornish metal?" , "roofing material" , "Silver-white element often used in food containers" .)