Relative taking extremely tender stable hand to a safe place (10)
I believe the answer is:
strongroom
'a safe place' is the definition.
(I've seen this before)
'relative taking extremely tender stable hand' is the wordplay.
'relative' becomes 'son' (son is a kind of relative).
'taking' means one lot of letters goes inside another.
'extremely' means to remove the middle letters.
'stable hand' becomes 'groom' (I've seen this before).
'tender' with its centre taken out is 'tr'.
'son' enclosing 'tr' is 'stron'.
'stron'+'groom'='STRONGROOM'
'to' is the link.
(Other definitions for strongroom that I've seen before include "Bank vault" , "safe place" .)