Take care, you say, having explosives around (5)
I believe the answer is:
mined
'having explosives around' is the definition.
(as in mines in the ground)
'take care you say' is the wordplay.
'take care' becomes 'mind' (I've seen this before).
'you say' shows a homophone (sound like).
'mind' is a homophone of 'MINED'.
(Other definitions for mined that I've seen before include "Sought diamonds?" , "proceeded secretly" , "Quarried" , "laid eggs" , "Brought up" .)