Regularly took only spade? (4)
I believe the answer is:
tool
'spade?' is the definition.
(spade is a kind of tool)
'regularly took only' is the wordplay.
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
'took'+'only'='tookonly'
The alternating letters of 'tookonly' are 'TOOL'.
(Other definitions for tool that I've seen before include "For example, saw" , "Drive motor skilfully" , "Implement - agency" , "Appliance" , "Hand implement" .)