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1 Across, Lecturer working with academic author (6)

4 Across, He had a hammer and chisel initially to chip inside the ribs (8)

10 Across, Fixation about growth is getting in the way (9)

13 Across,Mother uses broken toy shark to make dolls (10)

Compiler - ALCHEMI

Many Thanks

1 (Jack) L ON DON

Ma - mother + anagram of toy shark -matryoshka?

4 THOR A C IC
The "to" seems to spoil the surface, as I see it

Thing - fixation about wart - growth - thwarting?