God having a cross on chest (6)
I believe the answer is:
thorax
'chest' is the definition.
('thorax' can be a synonym of 'chest')
'god having a cross' is the wordplay.
'god' becomes 'thor' (Thor is an example**).
'having' says to put letters next to each other.
'cross' becomes 'x'.
'thor'+'a'+'x'='THORAX'
'on' is the link.
(Other definitions for thorax that I've seen before include "Trunk between neck and abdomen" , "Part of the body between the head and abdomen" , "Middle of a bee, for example" , "Part of insect bearing legs and wings" , "Upper part of the trunk" .)