Tinker (with) is a verb that means to make small changes or repairs to something, often in an experimental or playful manner. The crossword solutions for this term are FIDDLE (6 letters), ADJUST (6 letters), ALTER (5 letters), MESS (4 letters), TWEAK (5 letters), and TOY (3 letters). FIDDLE means to play with something in a casual or exploratory way, while ADJUST means to make small changes to something in order to improve it. ALTER means to change something in a significant way, and MESS means to make something untidy or disorganized. TWEAK means to make a small adjustment to something, and TOY means to play with something in a lighthearted way.