Crossword Genius

It's difficult for a motherless dog! (5)

Ross

I believe the answer is:

stiff

I'm a little stuck... Click here to teach me more about this clue!

This clue could be a double definition.

'it's difficult' is the first definition.
(I've seen this before)

'motherless dog' is the second definition.
'stiff' can be an answer for 'dog' (thesaurus). I am not certain of the 'motherless' bit.

'for a' is the link.

Can you help me to learn more?

(Other definitions for stiff that I've seen before include "tough" , "Frigid" , "Rigid, prim" , "Inflexible" , "Formal" .)

I've seen this clue in the Evening Standard.
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