Take a bit from the previous slab. Just like dad! (4,3,3,3,5)
I believe the answer is:
chip off the old block
'like dad' is the definition.
'chip off the old block' can be an answer for 'like' (thesaurus). I'm unsure of the 'dad' bit.
'take a bit from the previous slab' is the wordplay.
I cannot really understand how this works, but
'bit' could be 'chip' (synonyms) and 'chip' is found within the answer.
'from' could be 'off' (eg someone might be from or 'off' a TV show) and 'off' is located in the answer.
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is located in the answer.
'previous' could be 'old' (I've seen this in another clue) and 'old' is present in the answer.
This explanation may well be incorrect...
'just' acts as a link.
Can you help me to learn more?