The strain of motherhood (6,4)
I believe the answer is:
cradle song
'motherhood' is the definition.
I don't know anything about this answer so I can't judge whether this works.
'the strain' is the wordplay.
I cannot really understand how this works, but
'strain' could be 'song' (synonyms) and 'song' is found within the answer.
The remaining letters 'cradle' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
'of' acts as a link.
Can you help me to learn more?
(Another definition for cradle song that I've seen is " Lullaby".)