Forage in underground chamber cutting tin and germanium (8)
I believe the answer is:
scavenge
'forage' is the definition.
(I've seen this before)
'underground chamber cutting tin and germanium' is the wordplay.
'underground chamber' becomes 'cave' (I've seen this before).
'cutting' indicates putting letters inside (some letters cut their way into a word).
'tin' becomes 'sn' (Sn is the chemical symbol for tin).
'and' means one lot of letters go next to another.
'germanium' becomes 'ge' (Ge is the chemical symbol for germanium).
'cave' placed inside 'sn' is 'scaven'.
'scaven'+'ge'='SCAVENGE'
'in' acts as a link.
(Other definitions for scavenge that I've seen before include "Search for (carrion) as food" , "pick up what's discarded" , "Eat carrion - search bins" , "Pick up leavings" , "pick up something for nothing" .)